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Softly Broken A_4 Symmetry for Nearly Degenerate Neutrino Masses

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arxiv hep-ph/0106291 v1 pith:IP2GOODS submitted 2001-06-26 hep-ph

classification hep-ph
keywords massesneutrinosymmetrydegeneratemodelnearlybelowbreaking
verification ladder T0 review T1 audit T2 compute T3 formal

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The leptonic Higgs doublet model of neutrino masses is implemented with an A_4 discrete symmetry (the even permutation of 4 objects or equivalently the symmetry of the tetrahedron) which has 4 irreducible representations: 1, 1', 1'', and 3. The resulting spontaneous and soft breaking of A_4 provides a realistic model of charged-lepton masses as well as a nearly degenerate neutrino mass matrix. Phenomenological consequences at and below the TeV scale are discussed.

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Forward citations

Cited by 9 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 683 citations worldwide. Full citation record

  1. Towards AI-assisted Neutrino Flavor Theory Design

    hep-ph 2025-06 unverdicted novelty 7.0 of 10

    AMBer applies reinforcement learning with physics feedback to automate construction of neutrino flavor models that minimize free parameters, validated on known cases and extended to a new symmetry group.

  2. Maximal Abelian Flavor Symmetries

    hep-ph 2026-06 unverdicted novelty 6.0 of 10

    MAFS describes 15 flavor observables in SU(5) and SO(10) GUTs using 5 or 3 fitted small parameters at factor-of-two accuracy, implying large neutrino mixings and approximate leptogenesis without extra parameters in SU(5).

  3. Why Quarks and Leptons Demand Different Symmetries: A Systematic $Z_3$ Froggatt-Nielsen Analysis

    hep-ph 2026-03 unverdicted novelty 6.0 of 10

    A Z3 Froggatt-Nielsen model with one flavon reproduces quark and charged lepton hierarchies but yields neutrino mass-squared ratios too small by two orders of magnitude and random PMNS angles.

  4. A Predictive Non-Holomorphic Modular $A_4$ Linear Seesaw Framework Testable at DUNE

    hep-ph 2026-02 conditional novelty 6.0 of 10

    A non-holomorphic modular A4 linear seesaw model with six singlet fermions and one flavon reproduces observed neutrino mixing and predicts absolute mass and 0νββ ranges that DUNE and other experiments can test.

  5. Leptogenesis via Resonant Sequential Dominance and TBC3 Mixing in a Type-I Seesaw Model

    hep-ph 2026-08 conditional novelty 5.0 of 10

    Resonant Sequential Dominance with a new TBC3 mixing ansatz and an A4 Lagrangian can explain neutrino oscillations and the baryon asymmetry for a lightest right-handed neutrino mass of 0.13 to 230 TeV.

  6. A Non-Holomorphic Modular $A_4$ Framework for Resonant Leptogenesis with Gravitational Wave Signatures

    hep-ph 2026-07 conditional novelty 5.0 of 10

    A non-holomorphic modular A4 seesaw model yields quasi-degenerate right-handed neutrinos, enabling resonant leptogenesis at ~10^6 GeV and a double-peaked gravitational-wave signature.

  7. Light states in real 3HDMs with spontaneous CP violation and softly broken symmetries

    hep-ph 2026-05 unverdicted novelty 4.0 of 10

    In real 3HDMs with spontaneous CP violation and discrete symmetry on quartics, perturbativity bounds keep new scalars near the electroweak scale despite large quadratic terms.

  8. Two-sector leptogenesis in a two-Higgs-doublet model with spontaneous CP violation

    hep-ph 2025-09 reject novelty 4.0 of 10

    The paper proposes an A4-flavored two-Higgs-doublet model with two-sector leptogenesis and reports that a few-GeV dark fermion gives ΩDM/Ωb ~ 5 for M1 ~ 10^10 GeV.

  9. Neutrino Mass Predictions with an AI-based Algorithm under $A_4$ Modular Symmetry

    hep-ph 2025-08 reject novelty 3.0 of 10

    An A4 modular linear-seesaw neutrino model is fitted with the ILA optimizer, and the fitted parameters agree with oscillation and cosmological bounds.

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